The B-vitamins in human urine

Method for Evaluation of the Requirements of B-group Vitamins Using Tryptophan Metabolites in Human Urine

Tryptophan metabolism is directly involved with B-group vitamins such as vitamin B2, niacin, and vitamin B6, and indirectly with vitamin B1 and pantothenic acid. We evaluated the validity of requirements of B-group vitamins set by the Dietary Reference Intakes for the Japanese (DRI-J). We investigated the fate of dietary tryptophan in 10 Japanese adult men who ate the same diet based on DRI-J d...

The Presence of the Antineuritic and Antiscorbutic Vitamins in Urine.

FUNK [1914], SEIDELL [1921] and others applied chemical methods in order to determine the structure of the antineuritic vitamin. Their efforts to isolate these mysterious substances were not perfectly successful and therefore we do not wonder that nothing is known as yet of the metabolism of these factors. However, recently some experiments have been made to examine the excretion of antineuriti...

Urinary excretion of B-group vitamins reflects the nutritional status of B-group vitamins in rats

We have reported previously that the urinary excretion of B-group vitamins reflects recent dietary intakes of these vitamins. We also proposed reference values for the urinary levels of B-group vitamins for human subjects, and used these for evaluating human nutritional status. However, the question arises as to whether the urinary excretion of B-group vitamins in animals or human subjects decr...

The B Vitamins and Fat Metabolism

Previous work has shown that rice polish concentrate, used as a dietary supplement in conjunction with thiamine and riboflavin, caused a marked increase in the body fat of rats (1). Bender and Supplee (2) found that, under such conditions, this concentrate had a supplemental effect upon body weight. They correlated the weight changes with the presence or absence of dermatitis, interpreting thei...

Role of B Vitamins in Biological Methylation